Ubuntu has a lot of mobile oriented free software in it's mobile phone/tablet images that could be interesting for packaging into Debian.
Libraries / middleware
Various Qt bindings, libraries that are not all in Debian
Qtpim, qtsystems, qtfeedback, qt3d: git packages useful in mobile environment, already contributed to Debian's pkg-kde team's git repositories but not published since no upstream releases
GSettings Qt: https://launchpad.net/gsettings-qt
Ubuntu UI Toolkit (QML widgets to be used by applications): https://launchpad.net/ubuntu-ui-toolkit
Sensors, location and haptics plugins: https://launchpad.net/qtubuntu-sensors
Ofono Qt: https://launchpad.net/ofono-qt: Ofono usage from Qt.
Unity 8 is the shell for launching applications, showing indicators, displaying content from scopes, and so on. It depends on many other components like https://launchpad.net/unity-api and https://launchpad.net/unity-scopes-api.
Ubuntu Core Apps includes community developed applications that are in production use also in the sellable Ubuntu phones (not all pre-installed, like Terminal). They are for the most part pure QML with occasional C++ QML module, but depend on the QML module from Ubuntu UI Toolkit.
- Dropping Letters
- Stock Ticker App
- Sudoku App
- Ubuntu Calculator App
- Ubuntu Calendar App
- Ubuntu Clock App
- Ubuntu Document Viewer App
- Ubuntu File Manager App
- Ubuntu Music App
- Ubuntu Phone Commons
- Ubuntu RSS Feed Reader App
- Ubuntu Reminders app
- Ubuntu Terminal App
- Ubuntu Weather App
Devices running Ubuntu
- BQ Aquaris E4.5 Ubuntu Edition
- BQ Aquaris E5 Ubuntu Edition
- BQ Aquaris M10 HD Ubuntu Edition
- BQ Aquaris M10 FHD Ubuntu Edition
- Meizu MX4 Ubuntu Edition
- Meizu PRO 5 Ubuntu Edition
https://wiki.ubuntu.com/Touch/Devices has former or current Canonical supported references devices:
- LG Nexus 4
- Asus Nexus 7 (2013, wifi only)
- Samsung Nexus 10
Community supported devices at system-image.ubports.com:
See also the list of tens of working community ports (without a system image server).